Surveying
The scale of the photography taken from a height of 300 m, with a camera of focal length 15 cm, is

1 : 10,000
1 : 30,000
1 : 20,000
1 : 15,000

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Surveying
Dumpy level is most suitable when

many readings are to be taken from a single setting of the instrument
All of these
fly levelling is being done over long distance
the instrument is to be shifted frequently

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